Should be allowed tho. But i understand your point, 2nd sentence of rule 5 is a bit weird in my opinion. Since your opponent can always switch to get rid of the accuracy reduction i dont see any problem in using such moves.
Just DT and Minimize are trouble moves which...well....let the PvP environment getting a bit uncompetitive and more luck-based as pokemon already is. ;)
Well you pretty much explained yourself why sand attack is banned as well,although i wonder about those 2 moves since effect spore is allowed despite having the chance to induce sleep.